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Leases (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Rent expense $ 0.9 $ 0.8 $ 0.6
Sublease income 0.5 0.4 0.3
Future minimum sublease income under noncancelable operating subleases $ 0.6